Improvement in machines for making pitchforks



H. B. KINNEY. Machines for Making Pitch-Forks.

Patented April 23, I878. B\ Q FX B FQ W FKQQJ EH25 Q Q V N, PETERS. FHOHER, WASNINQTDN D C UNITED STATES PATENT OFFICE.

HORACE B. KINNEY, OF COLUMBUS, OHIO.

IMPROVEMENT IN MACHINES FOR MAKING PITCHFORKS.

Specification forming part of Letters Patent No. 202,658, dated April23, 1878; application filed July 9, 1877.

To all whom it may concern:

Be-it known that I, HORACE B. KINN'EY, of Columbus, in the county ofFranklin, State ot'Ohio, have invented a new and useful method,with newand improved devices, for making certain kinds of four or many prongedor tined pitching-forks from a blank of sheet metal; and I do herebydeclare the following, when taken in connection with the accompanyingdrawings and letters of referencemarked thereon,to be a full, clear, andexact description of the same, and which said drawings constitute a partof this specification,and represent, in-

Figures 1, 3, and 6, plan views of all the dies and pins in theirrelative positions. Fig. 5 represents a vertical end view of Fig. 3.Figs. 1, 2, 3, 4, 5 and 6 represent the article in the different stagesof the process.

Upon yoke A A, Fig. 1, is placed a shoulderdie, B B, with slot passingthrough its center for the reception of shank j, Fig. 3 representin gthe first stage of the process after shank is formed.

The blank sheet, after the shank has been formed upon one end, isdivided into three pron gs, the center pron g being sufficiently wide toadmit of being divided again, as shown in Figs. 3 and 4. Before beingagain divided it is taken by the shank j and placed in the slot ofshoulder-die B B of yoke A A, Fig. 1, and adjusted in line with thereciprocating dies 0 c, which are attachments to other parts referred tohereinaftern The dies 0 0, upon their ends opposite to shoulder-die B B,are wedge-shaped upon theupper one-half in depth, while the lower halfis a reverse angle upon their ends.

The dies 0 c, in their forward movement, e11- ter the two incisions madein the blank, Fig. 3, upon the upper wedge-shaped ends, and receive themiddle prong (still undivided) between them. Thus the outside prongs areopened far enough for the second forward movement of the dies 0 c tobring the pattern in contact with the reversed angles, thereby turningthem backward, as shown in Fig. 4, representing the second stage of theprocess.

In the first stage of cutting and opening the blank (represented inprocess, Fig. 2) the dies 0 c are adjusted to sliding head running inbed A of my Patent No. 56,954., dated August 7,

1866, by means of two pins passing down through the circled end ofsliding head, and also passing through the tenoned ends of dies 0 0,thus forming a hinge against the curved shoulders, to allow a lateralmovement. The dies 0 0, being adjusted in line with sliding head,receives a forward movement, which brings the reverse angle upon dies 0c, as shown by h, in contact with shoulder-die block B, that is placedupon yoke A, said yoke A having a vertical movement by means of camunderneath operated by foot-lever. By this means the yoke A is raisedvertical, and brings the cut blank to be opened in line with the pointedends of upper one-halfof dies 00, to be accomplished in the forwardmovement, opening the prongs sufficient for the second forward movementof dies 0 c,- and while the dies are receding for said purpose the yokeA is allowed to drop to its original position, which brings the blank orprongs in line with the loweronehalf of dies 0 c for the reversed angleat h, causing the prongs to be pressed backward, corresponding to angleof dies at h.

The second stage of the process having been completed, it is now readyfor the incision to be made in the middle prong running on a line withshank, which is effected by reheating and makingtheincision, stopping itshort, as shown in Fig. 5, of the incision made to form outer prongs, inorder to give stock for the formation of solid brace-head at junction ofprongs with shank. This being done, it is now ready to be received inthe dies, Fig. 3, for the opening and squeezing of shoulders, as shownin Fig. 6 of process.

Yoke A A and die B B, Fig. 3, are duplicate drawings of yoke A A and dieB B, Fig. 1, in order to show the additional fixtures attached thereto,comprising all the fixtures in position, relative with each other, forthe continuance of process.

It will be observed that in yoke A A, Fig. 1, are two apartments orholes, (1 d, passing down through yoke-bed, for the reception of twobolts or posts 01 (1, represented vertical in Fig. 5, and represented asbeing attached in the plan view, Fig. 3. These bolts rise vertical, whenadjusted to yoke-bed, sufliciently for the reception of work, Fig. 5, topass under a bar that ties the bolts together at top ends Upon thesebolts d d, Figs. 3 and 5, are hinged two levers, e 0, made of steel andgrooved at their points, placed so as to approximate each other in theact of pressing the side shoulders between middle and outside prongs,said levers tending to a straight line by the pressure of plunger D,Fig. 3, in its forward movement in the act of opening the middle prongs,as shown in Fig. 6, representing the fourth stage of the process. InFig. 5, representing a vertical end view of Fig. 3, will be seen a rodor shaft, 1, passing through the bolts (1 0! near top end and undercross-bar k, with right angles turned at each end, passing down intolevers e e at outer ends of same. The object of this device is tocontrol the levers e e in the act of putting in and taking out work, tobe opened and pressed into shape, as shown in Figs. 5"- and 6,representing the diflerent stages of the process, said shaftl beingrotated by means of another lever (not shown in drawings) that a weightis attached to, which keeps the levers e e closed, thereby avoiding anydanger of their coming in contact with plunger D, Fig. 3, by anycarelessness of operator.

In construction of this attachment (shown in Fig. 5 and adjusted to Fig.3) the yoke A A and die B B being duplicate drawings of Fig. 1, it willbe readily understood that all the forging represented by Figs. 3, 4, 5,and 6 of the diiferent stages of the process can be done by the use ofone yoke, A A, and one die, B B, as shown in Figs. 1 and 3.

After the prongs have been drawn under a trip-hammer, (and for thispurpose the devices shown in Fig. 6 are employed,) the side arms are tobe bent parallel, as shown in Fig. 7. g 9 represent a longer yoke andinside forms to fit the inside form of yoke for the refitting ofbrace-head m at junction of tines n n n 11, thereby giving the tinestheir relative position with each other, diverging in curves at the baseof each tine, giving them the appearance of symmetry and workmanship, aswell as forming a solid brace-head with neatness and dispatch. :In theforward movement of inside forms the side wings or levers f f, Fig. 6,are forced together by friction caused by their running between andagainst the taper of yoke g g, Fig. 6, side wings being grooved at sidesand points deep enough to admit full size of tines, which completesprocess of forging, as shown in Fig. 7.

The nature of my improvement relates to a new and useful machine formaking a four or many pronged or tined pitching-fork from a blank ofsheet metal, as shown in drawings, and the various devices shown anddescribed, which I propose to use in connection with bed and slidinghead driven by the major part of Patent No. 56,954, granted me, bearingdate August 7, 1866, and specifications accompanying said Letters Patentdescribe the applicacation and operation of the various devices.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination of the plunger D pivoted levers e, grooved die B, andyoke A capable of a vertical movement, substantially as set forth.

2. The combination of the dies 0, having reversed angles h and z 'i,grooved die B, and adjustable yoke A, as described.

3. The combination of the plunger D, die B, pivoted levers e, bolts d,cross-piece k, and rockshaft l, having the arms X and weighted lever,substantially as described.

HORACE B. KINNEY.

Witnesses:

P. ()sooon, G. L. EDICK.

